The 2015 GMC Yukon-XL runs on flex-fuel (unleaded/E85).
The 2015 GMC Yukon runs on flex-fuel (FFV).
yes it is 6X5.5
The 2015 GMC Yukon has a 6-speed shiftable automatic.
The 2015 GMC Yukon-XL has a 6-speed shiftable automatic.
The 2014 GMC Savana runs on flex-fuel (FFV).
The 2010 GMC Savana runs on flex-fuel (FFV).
The 2012 GMC Savana runs on flex-fuel (FFV).
The 2011 GMC Yukon runs on flex-fuel (FFV).
The 2014 GMC Yukon runs on flex-fuel (FFV).
The 2010 GMC Yukon runs on flex-fuel (FFV).
The 2013 GMC Yukon runs on flex-fuel (FFV).
The 2013 GMC Savana runs on flex-fuel (FFV).